Drilling Of 15 Nos Underground Non Coring Upward B.H 3 Nos From Rviib To Rvii Seam 2 Nos From Rviic To Rviib Seam 9 Nos From Rviib To Rviia Seam And 1 No From Rvi To Rviic Seam) At Cm Project Of Nakrakonda Kumardihi B Colliery.